On Tue, Jun 12, 2018 at 12:20 PM, HP3 <henddher.pedr...@gmail.com> wrote: > Hmmm > > In my testing, the class level functionality doesn't seem to be used ever. > Only the instance level.
yup, because you can't do inspect(cls).session, that wouldn't have worked. hence safer to use @property so that your code does not imply it implements the class-level functionality. > > I thought the class level functionality would be used if the > @hybrid_property.expression was declared: In this case, it was the recursive > CTE that didn't get the `cls.id` "automagically" populated but it never > worked. > > On Tuesday, June 12, 2018 at 10:19:35 AM UTC-5, Mike Bayer wrote: >> >> >> >> On Tue, Jun 12, 2018, 10:20 AM HP3 <henddher...@gmail.com> wrote: >>> >>> Hmmm >>> >>> I didn't use the @hybrid_property.expression for anything else so I ended >>> up not using it. >>> >>> However, I still use @hybrid_property ... wouldn't it be the same as >>> @property? >>> >>> (I thought they were "pretty much" the same) >> >> >> >> They're quite different because the hybrid has behavior at the class level >> as well, that's the whole complexity of hybrids >> >> >>> >>> >>> On Saturday, June 9, 2018 at 8:06:18 AM UTC-5, Mike Bayer wrote: >>>> >>>> That's fine but you should probably use a normal @property for that, >>>> unless you are still making use of a separate "expression" portion. >>>> >>>> On Fri, Jun 8, 2018, 8:04 PM HP3 <henddher...@gmail.com> wrote: >>>>> >>>>> I ended up settling for this: >>>>> >>>>> @hybrid_property >>>>> >>>>> def ancestors(self): >>>>> >>>>> session = inspect(self).session >>>>> >>>>> cte = session.query(P2B) \ >>>>> >>>>> .filter(P2B.id == self.id) \ >>>>> >>>>> .cte(name='cte', recursive=True) >>>>> >>>>> cte = cte.union( >>>>> >>>>> session.query(P2B) >>>>> >>>>> .filter(P2B.id == cte.c.parent_id) >>>>> >>>>> ) >>>>> >>>>> return session.query(cte).all() >>>>> >>>>> >>>>> And each time I call child.ancestors, the SQL CTE RECURSIVE is issued >>>>> (of course!?) >>>>> >>>>> Thanks again for all your help Mike! >>>>> >>>>> On Friday, June 8, 2018 at 6:39:05 PM UTC-5, HP3 wrote: >>>>>> >>>>>> BTW, the solution of `.params(child_id=child_id)` you provided worked >>>>>> perfectly - forgot to mentioned earlier. >>>>>> It issued the recursive CTE I wanted. >>>>>> >>>>>> I still need to ponder if I can simply live with a plain >>>>>> select().cte() within a vanilla method or @hybrid_property or >>>>>> @hybrid_method, all except @hybrid_property.expression as in the latter >>>>>> the >>>>>> "caller" would need to remember to bind `child_id` explicitly and forfeit >>>>>> the usage of `filter(ancs.c.id==child_id)` >>>>>> >>>>>> Thank you very much again Mike !!!! >>>>>> >>>>>> On Friday, June 8, 2018 at 6:06:54 PM UTC-5, Mike Bayer wrote: >>>>>>> >>>>>>> On Fri, Jun 8, 2018 at 6:59 PM, HP3 <henddher...@gmail.com> wrote: >>>>>>> > :( >>>>>>> > >>>>>>> > Basically, I was trying to prevent the SQL Select for each >>>>>>> > child-to-parent >>>>>>> > loop-iteration when navigating the tree from leaf to root because I >>>>>>> > figured >>>>>>> > I could use CTE recursive as @hybrid_property.expression. >>>>>>> > >>>>>>> > I was trying to take full advantage of @hybrid_property.expression >>>>>>> > like the >>>>>>> > examples in >>>>>>> > >>>>>>> > http://docs.sqlalchemy.org/en/latest/orm/extensions/hybrid.html#join-dependent-relationship-hybrid >>>>>>> > and >>>>>>> > >>>>>>> > http://docs.sqlalchemy.org/en/latest/orm/extensions/hybrid.html#module-sqlalchemy.ext.hybrid >>>>>>> > The examples show that self/cls is magically chosen depending on >>>>>>> > the >>>>>>> > context. >>>>>>> > >>>>>>> > Seems like I will end up having *limited* functionality for my >>>>>>> > `@hybrid_property.expression` as I would have to pass the extra >>>>>>> > param >>>>>>> > `cls_id` explicitly. >>>>>>> > >>>>>>> > I was hoping that >>>>>>> > `dbsession.query(P2B.ancestors).filter(P2B.id==mychildid)` >>>>>>> > would automagically bind 'mychildid' to `cls.id` within the >>>>>>> > @ancestors.expression. >>>>>>> > Perhaps such is possible some other way? >>>>>>> >>>>>>> a hybrid is just a function to give you a component of SQL. if you >>>>>>> want to change the inside of it, then you need to send a parameter on >>>>>>> the inside or do a transformation of it. I guess you could run a >>>>>>> transform, which is what the lazy loader does, e.g. looks for where >>>>>>> something like "cls.id" is and then replaces it but this is very >>>>>>> specialized, it wouldn't look any nicer from the calling point of >>>>>>> view. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> > >>>>>>> > Another catch is that by issuing the manual CTE, the session would >>>>>>> > always >>>>>>> > issue the SQL and never returned previously loaded ancestors. >>>>>>> > >>>>>>> > root >>>>>>> > / \ >>>>>>> > c1 c2 >>>>>>> > >>>>>>> > c1.ancestors and c2.ancestors will each issue SQL recursive CTE ... >>>>>>> > right? >>>>>>> > >>>>>>> > >>>>>>> > On Friday, June 8, 2018 at 5:33:08 PM UTC-5, Mike Bayer wrote: >>>>>>> >> >>>>>>> >> On Fri, Jun 8, 2018 at 5:14 PM, HP3 <henddher...@gmail.com> wrote: >>>>>>> >> > Thank you so much Mike >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > I am trying to write @ancestors.expression to produce a SQL like >>>>>>> >> > this: >>>>>>> >> > >>>>>>> >> > WITH RECURSIVE scte(id, parent_id) AS >>>>>>> >> > >>>>>>> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>>>> >> > >>>>>>> >> > FROM p2bases >>>>>>> >> > >>>>>>> >> > WHERE p2bases.id = %(id_1)s --- This is the param I need at >>>>>>> >> > runtime >>>>>>> >> > (cls.id) >>>>>>> >> > >>>>>>> >> > UNION SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>>>> >> > >>>>>>> >> > FROM p2bases, scte >>>>>>> >> > >>>>>>> >> > WHERE p2bases.id = scte.parent_id) >>>>>>> >> > >>>>>>> >> > SELECT scte.id >>>>>>> >> > >>>>>>> >> > FROM scte >>>>>>> >> >>>>>>> >> >>>>>>> >> you'd have to put the parameter inside the CTE then, here's one >>>>>>> >> way: >>>>>>> >> >>>>>>> >> @ancestors.expression >>>>>>> >> def ancestors(cls): >>>>>>> >> cte = select([P2B.id, P2B.parent_id]) \ >>>>>>> >> .where(P2B.id == bindparam("cls_id")) \ >>>>>>> >> .cte(name='cte', recursive=True) >>>>>>> >> cte = cte.union( >>>>>>> >> select([P2B.id, P2B.parent_id]) >>>>>>> >> .where(P2B.id == cte.c.parent_id) >>>>>>> >> ) >>>>>>> >> return cte >>>>>>> >> >>>>>>> >> >>>>>>> >> then you do: >>>>>>> >> >>>>>>> >> dbsession.query(P2B.ancestors).params(cls_id=child_id).all() >>>>>>> >> >>>>>>> >> >>>>>>> >> but note that you always need to provide params(cls_id=x) in that >>>>>>> >> case. >>>>>>> >> >>>>>>> >> >>>>>>> >> >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > Here is the @hybrid_property.expression >>>>>>> >> > >>>>>>> >> > @ancestors.expression >>>>>>> >> > >>>>>>> >> > def ancestors(cls): >>>>>>> >> > >>>>>>> >> > cte = select([P2B.id, P2B.parent_id]) \ >>>>>>> >> > >>>>>>> >> > .where(P2B.id == cls.id) \ # <<<<<<< I cannot figure >>>>>>> >> > out how >>>>>>> >> > make cls.id the param >>>>>>> >> > >>>>>>> >> > .cte(name='cte', recursive=True) >>>>>>> >> > >>>>>>> >> > cte = cte.union( >>>>>>> >> > >>>>>>> >> > select([P2B.id, P2B.parent_id]) >>>>>>> >> > >>>>>>> >> > .where(P2B.id == cte.c.parent_id) >>>>>>> >> > >>>>>>> >> > ) >>>>>>> >> > >>>>>>> >> > return cte >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > I tried alias, aliased and bindparam in multiple ways >>>>>>> >> > unsuccessfully. >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > The SQL that is coming out doesn't set the first (cte anchor) >>>>>>> >> > WHERE >>>>>>> >> > clause >>>>>>> >> > with the bound param id_1 (cls.id in the @ancestors.expression). >>>>>>> >> > Instead, is the column again? >>>>>>> >> > >>>>>>> >> > WITH RECURSIVE cte(id, parent_id) AS >>>>>>> >> > >>>>>>> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>>>> >> > >>>>>>> >> > FROM p2bases >>>>>>> >> > >>>>>>> >> > WHERE p2bases.id = p2bases.id -- <<<< I can't figure out how to >>>>>>> >> > make >>>>>>> >> > expr.left 'cls.id' from the @ancestors.expression >>>>>>> >> > >>>>>>> >> > UNION SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>>>> >> > >>>>>>> >> > FROM p2bases, cte >>>>>>> >> > >>>>>>> >> > WHERE p2bases.id = cte.parent_id) >>>>>>> >> > >>>>>>> >> > SELECT cte.id AS cte_id, cte.parent_id AS cte_parent_id >>>>>>> >> > >>>>>>> >> > FROM cte >>>>>>> >> > >>>>>>> >> > WHERE cte.id = %(id_1)s >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > The correct SQL comes out when I do this: >>>>>>> >> > >>>>>>> >> > scte = select([P2B.id, P2B.parent_id]) \ >>>>>>> >> > >>>>>>> >> > .where(P2B.id == child_id) \ >>>>>>> >> > >>>>>>> >> > .cte(name='scte', recursive=True) >>>>>>> >> > >>>>>>> >> > scte = scte.union( >>>>>>> >> > >>>>>>> >> > select([P2B.id, P2B.parent_id]).where(P2B.id == >>>>>>> >> > scte.c.parent_id)) >>>>>>> >> > >>>>>>> >> > s = select([scte.c.id]) >>>>>>> >> > >>>>>>> >> > ancestors = dbsession.execute(s).fetchall() >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > But I don't know how to integrate that into my >>>>>>> >> > @ancestors.expression >>>>>>> >> > >>>>>>> >> > I want `child_id` to get the value of `cls.id` when the >>>>>>> >> > @hybrid_property >>>>>>> >> > is >>>>>>> >> > called for the class. >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > >>>>>>> >> > On Friday, June 8, 2018 at 1:48:55 PM UTC-5, Mike Bayer wrote: >>>>>>> >> >> >>>>>>> >> >> the example is huge can you point out which two queries you'd >>>>>>> >> >> like to >>>>>>> >> >> compare? >>>>>>> >> >> >>>>>>> >> >> this: >>>>>>> >> >> cte = dbsession.query(P2B.id, P2B.parent_id) \ >>>>>>> >> >> .filter(P2B.id == child_id) \ >>>>>>> >> >> .cte(name='cte', recursive=True) >>>>>>> >> >> cte = cte.union( >>>>>>> >> >> dbsession.query(P2B.id, P2B.parent_id).filter( >>>>>>> >> >> P2B.id == cte.c.parent_id)) >>>>>>> >> >> cteids = dbsession.query(cte.c.id) >>>>>>> >> >> ancestors = >>>>>>> >> >> dbsession.query(P2B).filter(P2B.id.in_(cteids)).all()[1:] >>>>>>> >> >> >>>>>>> >> >> >>>>>>> >> >> and this? >>>>>>> >> >> >>>>>>> >> >> ancestors = dbsession.query( >>>>>>> >> >> P2B.ancestors).filter(P2B.id == child_id).all() # >>>>>>> >> >> <<<< >>>>>>> >> >> child_id IS NEVER USED IN EXPRESSION >>>>>>> >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> >> >> it might surprise you to know I barely follow what these >>>>>>> >> >> queries are >>>>>>> >> >> returning for you, I just look very briefly to get the desired >>>>>>> >> >> syntax >>>>>>> >> >> right, so a simple "here's teh code hre's the SQL" is best >>>>>>> >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> >> >> On Fri, Jun 8, 2018 at 2:44 PM, HP3 <henddher...@gmail.com> >>>>>>> >> >> wrote: >>>>>>> >> >> > Ahhhh!!! Makes perfect sense! >>>>>>> >> >> > >>>>>>> >> >> > But there is something still amiss ... >>>>>>> >> >> > The last 2 assertions are triggering because the query is >>>>>>> >> >> > returning a >>>>>>> >> >> > single >>>>>>> >> >> > ancestor (self) instead of the whole recursive list. >>>>>>> >> >> > >>>>>>> >> >> > See the plain CTE and the @hybrid_property.expression CTE: >>>>>>> >> >> > The where >>>>>>> >> >> > clauses >>>>>>> >> >> > are still different :( >>>>>>> >> >> > (and hence the output) >>>>>>> >> >> > >>>>>>> >> >> > Are my @hybrid_property.expressions incorrectly declared? >>>>>>> >> >> > >>>>>>> >> >> > >>>>>>> >> >> > CTE ---------------------------------------- >>>>>>> >> >> > >>>>>>> >> >> > 2018-06-08 13:14:44,144 INFO sqlalchemy.engine.base.Engine >>>>>>> >> >> > BEGIN >>>>>>> >> >> > (implicit) >>>>>>> >> >> > >>>>>>> >> >> > 2018-06-08 13:14:44,145 INFO sqlalchemy.engine.base.Engine >>>>>>> >> >> > WITH >>>>>>> >> >> > RECURSIVE >>>>>>> >> >> > cte(id, parent_id) AS >>>>>>> >> >> > >>>>>>> >> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>>>> >> >> > >>>>>>> >> >> > FROM p2bases >>>>>>> >> >> > >>>>>>> >> >> > WHERE p2bases.id = %(id_1)s UNION SELECT p2bases.id AS >>>>>>> >> >> > p2bases_id, >>>>>>> >> >> > p2bases.parent_id AS p2bases_parent_id >>>>>>> >> >> > >>>>>>> >> >> > FROM p2bases, cte >>>>>>> >> >> > >>>>>>> >> >> > WHERE p2bases.id = cte.parent_id) >>>>>>> >> >> > >>>>>>> >> >> > SELECT p2bases.id AS p2bases_id, p2bases.uuid AS >>>>>>> >> >> > p2bases_uuid, >>>>>>> >> >> > p2bases.classname AS p2bases_classname, p2bases.position AS >>>>>>> >> >> > p2bases_position, p2bases.extras AS p2bases_extras, >>>>>>> >> >> > p2bases.val AS >>>>>>> >> >> > p2bases_val, p2bases.time AS p2bases_time, p2bases.parent_id >>>>>>> >> >> > AS >>>>>>> >> >> > p2bases_parent_id >>>>>>> >> >> > >>>>>>> >> >> > FROM p2bases >>>>>>> >> >> > >>>>>>> >> >> > WHERE p2bases.id IN (SELECT cte.id AS cte_id >>>>>>> >> >> > >>>>>>> >> >> > FROM cte) >>>>>>> >> >> > >>>>>>> >> >> > 2018-06-08 13:14:44,146 INFO sqlalchemy.engine.base.Engine >>>>>>> >> >> > {'id_1': >>>>>>> >> >> > 20} >>>>>>> >> >> > >>>>>>> >> >> > CTE ANCESTORS <__main__.P2Pg object at 0x10bf94be0> >>>>>>> >> >> > >>>>>>> >> >> > CTE ANCESTORS <__main__.P2An object at 0x10bf9a160> >>>>>>> >> >> > >>>>>>> >> >> > CTE ANCESTORS <__main__.P2KVP object at 0x10bf9a6a0> >>>>>>> >> >> > >>>>>>> >> >> > >>>>>>> >> >> > >>>>>>> >> >> > @hybrid_property.expression ANCESTORS CLS >>>>>>> >> >> > ---------------------------------------- >>>>>>> >> >> > >>>>>>> >> >> > 2018-06-08 13:14:44,181 INFO sqlalchemy.engine.base.Engine >>>>>>> >> >> > WITH >>>>>>> >> >> > RECURSIVE >>>>>>> >> >> > cte(id, parent_id) AS >>>>>>> >> >> > >>>>>>> >> >> > (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>>>> >> >> > >>>>>>> >> >> > FROM p2bases >>>>>>> >> >> > >>>>>>> >> >> > WHERE p2bases.id = p2bases.id UNION SELECT p2bases.id AS id, >>>>>>> >> >> > p2bases.parent_id AS parent_id >>>>>>> >> >> > >>>>>>> >> >> > FROM p2bases, cte >>>>>>> >> >> > >>>>>>> >> >> > WHERE p2bases.id = cte.parent_id) >>>>>>> >> >> > >>>>>>> >> >> > SELECT cte.id AS cte_id, cte.parent_id AS cte_parent_id >>>>>>> >> >> > >>>>>>> >> >> > FROM cte >>>>>>> >> >> > >>>>>>> >> >> > WHERE cte.id = %(id_1)s >>>>>>> >> >> > >>>>>>> >> >> > 2018-06-08 13:14:44,182 INFO sqlalchemy.engine.base.Engine >>>>>>> >> >> > {'id_1': >>>>>>> >> >> > 20} >>>>>>> >> >> > >>>>>>> >> >> > @hybrid_property.expression ANCESTORS CLS (20, 5) >>>>>>> >> >> > >>>>>>> >> >> > >>>>>>> >> >> > >>>>>>> >> >> > >>>>>>> >> >> > On Friday, June 8, 2018 at 12:27:28 PM UTC-5, Mike Bayer >>>>>>> >> >> > wrote: >>>>>>> >> >> >> >>>>>>> >> >> >> On Fri, Jun 8, 2018 at 12:16 PM, HP3 <henddher...@gmail.com> >>>>>>> >> >> >> wrote: >>>>>>> >> >> >> > Attached the whole file >>>>>>> >> >> >> >>>>>>> >> >> >> OK, removing all the "zope" stuff as well as all the other >>>>>>> >> >> >> queries >>>>>>> >> >> >> that aren't noted as failing, I am only looking at this >>>>>>> >> >> >> query: >>>>>>> >> >> >> >>>>>>> >> >> >> ancestors = dbsession.query(P2B.ancestors).filter(P2B.id >>>>>>> >> >> >> == >>>>>>> >> >> >> child_id).all() # <<<< child_id IS NEVER USED IN EXPRESSION >>>>>>> >> >> >> >>>>>>> >> >> >> the problem is that you are re-introducing P2B a second >>>>>>> >> >> >> time, rather >>>>>>> >> >> >> than referring to the columns that your CTE returns, it >>>>>>> >> >> >> should be: >>>>>>> >> >> >> >>>>>>> >> >> >> ansc = P2B.ancestors >>>>>>> >> >> >> ancestors = dbsession.query(ansc).filter(ansc.c.id == >>>>>>> >> >> >> child_id).all() >>>>>>> >> >> >> >>>>>>> >> >> >> this produces SQL that obeys the same form I see at >>>>>>> >> >> >> >>>>>>> >> >> >> https://www.postgresql.org/docs/current/static/queries-with.html. >>>>>>> >> >> >> >>>>>>> >> >> >> Since P2B.ancestors produces a new selectable each time, you >>>>>>> >> >> >> need to >>>>>>> >> >> >> assign it to a variable in order to refer to its set of >>>>>>> >> >> >> columns >>>>>>> >> >> >> without re-introducing it. >>>>>>> >> >> >> >>>>>>> >> >> >> >>>>>>> >> >> >> >>>>>>> >> >> >> >>>>>>> >> >> >> > >>>>>>> >> >> >> > >>>>>>> >> >> >> > On Thursday, June 7, 2018 at 7:01:21 PM UTC-5, HP3 wrote: >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> Hello >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> Having difficulty with CTE and >>>>>>> >> >> >> >> @hybrid_property.expression on a >>>>>>> >> >> >> >> adjacency >>>>>>> >> >> >> >> list model. >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> class P2B(Base): >>>>>>> >> >> >> >> __tablename__ = 'p2bases' >>>>>>> >> >> >> >> id = Column(Integer, primary_key=True) >>>>>>> >> >> >> >> classname = Column(String) >>>>>>> >> >> >> >> parent_id = Column( >>>>>>> >> >> >> >> Integer, >>>>>>> >> >> >> >> ForeignKey('p2bases.id', ondelete='CASCADE'), >>>>>>> >> >> >> >> index=True >>>>>>> >> >> >> >> ) >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> parent = relationship( >>>>>>> >> >> >> >> 'P2B', >>>>>>> >> >> >> >> primaryjoin='P2B.parent_id == P2B.id', >>>>>>> >> >> >> >> foreign_keys='P2B.id', >>>>>>> >> >> >> >> uselist=False >>>>>>> >> >> >> >> ) >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> __mapper_args__ = { >>>>>>> >> >> >> >> 'polymorphic_identity': 'P2B', >>>>>>> >> >> >> >> 'polymorphic_on': classname >>>>>>> >> >> >> >> } >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> @hybrid_property >>>>>>> >> >> >> >> def ancestors(self): >>>>>>> >> >> >> >> _ancestors = [] >>>>>>> >> >> >> >> parent = self.parent >>>>>>> >> >> >> >> while parent is not None: >>>>>>> >> >> >> >> _ancestors.append(parent) >>>>>>> >> >> >> >> parent = parent.parent >>>>>>> >> >> >> >> return _ancestors >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> @ancestors.expression >>>>>>> >> >> >> >> def ancestors(cls): >>>>>>> >> >> >> >> cte = select([P2B.id, P2B.parent_id]) \ >>>>>>> >> >> >> >> .where(P2B.id == cls.id) \ # <<<<<< Based on >>>>>>> >> >> >> >> Example1 >>>>>>> >> >> >> >> .cte(name='cte', recursive=True) >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> cte = cte.union( >>>>>>> >> >> >> >> select([P2B.id, P2B.parent_id]) >>>>>>> >> >> >> >> .where(P2B.id == cte.c.parent_id) >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> ) >>>>>>> >> >> >> >> return cte >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> The issue I am facing is that the SQL statement for >>>>>>> >> >> >> >> ancestors >>>>>>> >> >> >> >> expression >>>>>>> >> >> >> >> becomes this >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> WITH RECURSIVE cte(id, parent_id) AS >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> (SELECT p2bases.id AS id, p2bases.parent_id AS parent_id >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> FROM p2bases >>>>>>> >> >> >> >> >>>>>>> >> >> >> >> WHERE p2bases.id = <a href="http://p2bases.id"; >>>>>>> >> >> >> >> target="_blank" rel="nofollow" >>>>>>> >> >> >> >> onmousedown="this.href='http://www.google.com/url?q\x3dhttp%3A%2F%2Fp2bases.id\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNFXb6853cCgweqpw68fbajiKFHNJg';return >>>>>>> >> >> >> >> true;" >>>>>>> >> >> >> >> onclick="this.href='http://www.google.com/url?q\x3dhttp%3A%2F%2Fp2bases.id\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQj >>>>> >>>>> -- >>>>> SQLAlchemy - >>>>> The Python SQL Toolkit and Object Relational Mapper >>>>> >>>>> http://www.sqlalchemy.org/ >>>>> >>>>> To post example code, please provide an MCVE: Minimal, Complete, and >>>>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >>>>> description. >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "sqlalchemy" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to sqlalchemy+...@googlegroups.com. >>>>> To post to this group, send email to sqlal...@googlegroups.com. >>>>> Visit this group at https://groups.google.com/group/sqlalchemy. >>>>> For more options, visit https://groups.google.com/d/optout. >>> >>> -- >>> SQLAlchemy - >>> The Python SQL Toolkit and Object Relational Mapper >>> >>> http://www.sqlalchemy.org/ >>> >>> To post example code, please provide an MCVE: Minimal, Complete, and >>> Verifiable Example. See http://stackoverflow.com/help/mcve for a full >>> description. >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "sqlalchemy" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to sqlalchemy+...@googlegroups.com. >>> To post to this group, send email to sqlal...@googlegroups.com. >>> Visit this group at https://groups.google.com/group/sqlalchemy. >>> For more options, visit https://groups.google.com/d/optout. > > -- > SQLAlchemy - > The Python SQL Toolkit and Object Relational Mapper > > http://www.sqlalchemy.org/ > > To post example code, please provide an MCVE: Minimal, Complete, and > Verifiable Example. See http://stackoverflow.com/help/mcve for a full > description. > --- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sqlalchemy+unsubscr...@googlegroups.com. > To post to this group, send email to sqlalchemy@googlegroups.com. > Visit this group at https://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. 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